Pole-changer



H. D. CURRIER.

POLE CHANGER.

APPLICATION FILED JUNE 28, l9l5.

1 ,330,059. Patented Feb. 10, 1920.

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HZYDFZYEZ' 7 v UNITED STATES PATENT OFFICE.

HIRAM D. CURRIER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 KELLOGG SWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

I'OLE-CHANGER.

To all whom it may concern:

Be it known that I, HIRAM D. CURRIER, a

citizen of the United States of America, re-- siding in Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Pole-Changers, of which the following is a specification.

My invention relates to apparatus for use in automatically converting the current of a battery or other source into pulsating current suitable for use, for example, in operating harmonic or tuned bells or ringers, such as the bells or ringers of a telephone system.

Generally stated, the object of'my invention' is the provision of improved means for operating ringers or bells. Special objects of my invention are, the provision of a novel circuit arrangement whereby pulsating current may be used to operate tuned or harmonic bells; the provision of a mechanismhaving an operating circuit which is entirely independent of and distinct from the generating circuit; the provision ofsimplified pole changing mechanism for producing pulsating current and for discharging the condenser at a substation between pulsations whereby the effect produced is equivalent to that produced by alternating current; and

the provision of certain details and features of improvement and combinations tending to increase the general efficiency and serviceability of a mechanism of the above character.

To the foregoing, and other useful ends, my invention consists in matters hereinafter set-forth and claimed.

Referring to the accompanying drawing, I have shown diagrammatically the circuit arrangement of a current generator device embodying the principles of my invention. The mechanical structure of the mechanism embodying the circuit. arrangement of my lnvention maybe of any of the well-known types, such as shown in United States Letters Patent No. 1,058,009, to A. H. Weiss,

issued April'lst, 1913. As pole changers of thischaracter are well-known in the art and as my invention relates more to the circuit arrangement of'the same. it is thought unnecessary to further describe in detail the mechanical structure of the said pole changer. The pole changer C, as represented, com prises a tuned reed or pendulum 10 provided with a Weighted member 11 adapted to be adjusted vertically along the tuned reed Specification of Letters Patent.

so that the frequency of the vibrating reed may be readily varied. Attached to the member 10 is a circuit interrupter 14 adapted to open and close the circuit of the vibrating magnet 16. The magnet 16 pro vides motive power to keep the tuned reed oscillating as long as its local operating circuit is closed. Attached to the reed or pendulum member 10, is a bufler 17 adapted to operate the contacts 12 and 13.

A pair of transformers or induction coils 2 and 3, each comprisinga primary and a secondary winding, are shown associated with the pole changing mechanism. One terminal of the secondary winding 4 of the transformer 2 is shown connected directly to a condenser K and through to a harmonic or tuned bell 8. One terminal of the secondary winding 6 of the induction coil 3 is shown connected directly to a condenser K and then to a harmonic or tuned beil 9. However, it is to be understood that I have shown the tuned bells connected directly to the secondary winding of the induction coils for illustration purposes only, for in actual practice one terminal of the secondary windings is connected direct to bus bars on the exchange power board. The current from the bus bars then is carried through exservice it is customary to tune the bells at each substation to respond to a certain frequency of current and to no other. I therefor provide a different tuned current generator for each differently tuned bell connected to the party line. While I have shown a battery for furnishing the motive power to the vibrating magnet which operates the tuned reed separate from the battery connected to the primary windings of the induction coils or transformers yet it is to be understood that the same battery mai yl be used for both purposes.

I aving described ingeneral the apparatus embodied in my invention, I will now describe more in detail its operation.

When the manual-switch 15 is closed, a local operating circuit is closed for vibrating magnet 16. The vibrating magnet 16, upon energizing, closes a circuit through the primary winding5, of the induction coil 2, traced from the positive pole of battery Patented Feb. 10, 1920. Application filed June 28, 1915. Serial No. 36,696.

through the primary winding of said induction coil, contact 18, member 10, back to the opposite pole of battery. At the same time that this circuit is closed through the primary of the induction coil, the buffer 17 operates to close contacts 12 and 19 thereby connectingv ground to one terminal of the secondary winding 4. Upon the closure of the above traced circuit through the primary winding 5, an impulse is induced in the secondary winding 4, extending from the secondary winding through the harmonic bell 8 to ground and through contacts 19 and 12 to round thus charging the condenser d causing the magnet of the harmonic bell to attract its armature in one direction.

' The magnet 16, having its local energizing circuit opened at contacts 21 and 14, allows the pendulum 10 to swing back to the left thus allowing contact '12 to disengage contact 19 and to engage contact 22 thereby connecting ground direct to one terminal of the condenser K thereb discharging the condenser K and causing the magnet of the harmonic bell to attract its arm'atur'e in the opposite direction. The pendulum 10 upon reaching the extent of its travel again closes contacts 21 and 14:, thereby again closing an energizing circuit through the vibrating magnet 16 and causing the pendulum to be carried to the right. .The above operation is repeated for each oscillation of the pendulum 10 thereby transmitting impulses at a certain frequency to the harmonic hell 8 and at the same time short-circuiting the condenser K and harmonic bell'8'through ound, between each oscillation, thereby discharging the condenser K. It will be noted that the apparatus associated with the induction coil 3 is similar to the apparatus associated with the induction coil 2 and opcrates inthe same manner to transmit operating current to the tuned bell 9. By reversing the flow of the current in the primary windingthe induced impulses inthe secondary winding may be made of opposite polarity. Thatis, either negative or ositive pulsating current may-be provid g It is thus seen that I have provided apole changer having .two separate current generating circuits and which has an operating circuit entirely. separate from the generating circuits. While I have only shown one specific circuit arrangement, yet it is to be understood that I do not :WiS h to limit myself to 'the specific arrangement shown as many changes and modifications will readily suggest themselves to one skilled, in the art,

therefore I wish to cover all that comes uiithin the spirit and scope of the appended c aims.

Having described myinvention, what I claim as new and desire to secure by United States Letters Patent, is;

' 1; In a signaling system, a, tuned signal receiving device, a condenser associated with said device, means for supplying pulsating current to said device, and means for shortc1rcu1t1ng sa1d devlce and condenser between such pulsations whereby the joint effect of saidpulsating current and said short circuiting causes the said tuned device to be Y said device'including induced pulsations of current ofione character adapted to operate 1 .a movable member of said tuned polarized receiving device in one direction and grounded impulses interposed between sa1d pulsations of current-v for operating said.

movable member in the" opposite direction.

4. A signaling system including a signal receiving device, a vibratory "member, a

transformer having a primary and a secondary winding, a circuit "controller '-'oper-- ated nected in circuit with'said primary winding for intermittently closing a circuit through said primary, winding thereby causing said secondarywinding to deliverpulsatlng current at a redetermined frequency, a second circuit controller operated by said vibratory member'and ada ted ,to conductively supply grounded im u ses,

and means for connectmg said pu satin current and said grounded 'im 'ulsesto sai signal receiving device" there y operating:

the same.

5'. A signaling system including a polarized device provided with an armature, a

y said vibratory". member and con.-. .100

condenser connected in circuitwith said polarized device, a vibratory member, a transformer provided w1th a prima and a sec- V .v

ondary winding, means contro led by said vibratory member for intermittently closing a circuit through said primary winding thereby causing said secondary windin to deliver pulsations of current'to said p0 ar-" ized device to operate its armature in one direction, and means controlled by said vibratory member for discharging said condenser to operate the armatureofsaid 130- larized device in theopposite'direction.

aling system includ+fl I 6.,An electrical si ing a polarized device provided with anarmature, a current generating device,'said current generating device being adap'tedto 1 ,ssopse produce and inductively connect impulses of current of one character to said polarized device to operate the armature thereof in one direction, and to conductively interpose grounded impulses between said pulsations to operate the armature of said polarized device in the opposite direction.

7. An electrical signaling system includ ing a polarized device provided with an armature, a current generating device, said current generating device being adapted to inductively connect pulsations of current of one character to operate the armature of said polarized device in one direction and to conductively short circuit said polarized device between pulsations to operate the armature of said polarized device in the opposite direction.

8. In a signaling system, a polarized device provided with an armature, a condenser connected in circuit with said polarized device, a current generating device for supplying pulsating current to said polarized device to operate the armature thereof in one direction, and means for operating the said current generating device to discharge said condenser through said polarized device between the pulsations of current to operate the armature thereof in the opposite direction.

9. A signaling system including a polarized device provided with an armature, a

vibratory member, a transformer provided with a primary and a secondary WIIIClIII means controlled by said vibratory member for intermittently closing a circuit through 'member, a condenser connected in circuit with said polarized device, a current generating device for supplylng pulsating current to said polarized device to operate the movable member thereof in one direction, and means controlled by'said current generating device to discharge said condenser through said polarized device betweenthe pulsations of current to operate the movable member thereofin the opposite direction.

Signed by me at Chicago'in the county of Cook and State of Illinois, in the presence of two Witnesses.

HIRAM D: CURRIER.

Witnesses GEORGE A.- YANooHowsm, WM. BERGHAHN. 

